package com.lw.state;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @author LW
 * @2020/8/17 14:34
 */

public class TestSleep2 {


    public static void main(String[] args) {
//        try {
//            tenDown();
//        } catch (InterruptedException e) {
//            e.printStackTrace();
//        }

        //打印系统时间
        Date startTime = new Date(System.currentTimeMillis());//获取系统当前时间
        while (true){
            try {//一秒钟跑一下，实时打印
                Thread.sleep(1000);
                System.out.println(new SimpleDateFormat("HH:mm:ss").format(startTime));
                startTime = new Date(System.currentTimeMillis());//更新当前时间
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }
    }



    //模拟倒计时
    public static void tenDown() throws InterruptedException {
        int num = 10;
        while (true) {
            Thread.sleep(1000);
            System.out.println(num--);
            if (num<=0){
                break;
            }
        }
    }
}
